In an interview with CNBC on the exchange floor shortly after the merger accord was announced, Niederauer said a name for the new exchange hasn't been decided on. But he did say that "the name will not be DB NYSE group."
Under the terms of the deal NYSE Euronext stock will be exchanged for 0.47 shares in the new company, while Deutsche Boerse shares will be swapped on a one-for-one basis, the exchanges said in a statement on Tuesday.
The exchanges face intense competition in their traditional stock-trading business from younger trading venues geared toward today's increasingly dominant high-speed electronic traders.
NYSE Euronext and others have responded by investing heavily in technology and expanding into more profitable derivatives trading.
The merger deal creates an unprecedented exchange powerhouse with more than $20 trillion in annual trading volume and operations in Germany, France, Britain, Amsterdam, Portugal, Belgium, and the United States.